Cori Roberts of St. Cloud, Minnesota, incurred more than $8,000 in medical bills after she was diagnosed at CentraCare with early-stage cervical cancer. She says the health system told her she made too much — about $41,000 a year — to qualify for financial aid. Anthony Souffle/The Minnesota Star Tribune hide caption toggle caption Anthony Souffle/The Minnesota Star Tribune ST. CLOUD, Minn. — Cori Roberts was living in a rented basement four years ago when she was diagnosed with early-stage cervical cancer. Recently divorced, the former stay-at-home mother had returned to work in her mid-40s, taking a human resources job that paid $41,000 a year. Then, despite having insurance, she was hit with more than $8,000 in medical bills. "I had my car and a basket of clothes," Roberts recalled. "Medical bills were not something I could have afforded." Roberts sought financial assistance from CentraCare, the St. Cloud-based health system that treated her.…